Method and apparatus for diagnosing the state of a machine
First Claim
1. A method of extracting a set of events from a vibration signal of a machine wherein a subset of said events corresponds to a physical action of said machine, comprising:
- sensing a vibrational signal of said machine;
creating a time domain signature from said vibrational signals;
processing said signature to obtain a set of clustered events from a plurality of sets of possible events including in said set of clustered events a subset which corresponds to the physical action of said machine; and
comparing said subset with a reference subset to determine the mechanical condition of said machine.
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Abstract
A method and apparatus for diagnosing the mechanical condition of a machine. The method of the invention includes the following steps: sensing a reference vibrational signal of the machine; creating a reference set of events from the reference vibrational signal of the machine; saving the reference set of events; sensing a test vibrational signal of the machine; creating a test set of events from the test vibrational signal of the machine; and, comparing the test set of events with the reference set of events to determine the mechanical condition of the machine. The invention further includes a method of extracting a set of events from a vibrational signal of a machine wherein a subset of the events corresponds to a physical action of the machine. The invention also includes a method of determining a set of clustered events for a machine from a plurality of sets of events, wherein each of the sets has a number of events therein. An apparatus is also disclosed for implementing the method of the invention
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Citations
25 Claims
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1. A method of extracting a set of events from a vibration signal of a machine wherein a subset of said events corresponds to a physical action of said machine, comprising:
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sensing a vibrational signal of said machine; creating a time domain signature from said vibrational signals; processing said signature to obtain a set of clustered events from a plurality of sets of possible events including in said set of clustered events a subset which corresponds to the physical action of said machine; and comparing said subset with a reference subset to determine the mechanical condition of said machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of diagnosing a mechanical condition of a machine, comprising:
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sensing a reference vibrational signal of said machine; creating a reference set of events form said reference vibrational signal of said machine by first creating a reference envelope from said reference vibrational signal and then extracting a set of reference times from said reference envelope; saving said reference set of times; sensing a test vibrational signal of said machine; creating a test set of events from said test vibrational signal of said machine by creating a test envelope from said test vibrational signal and extracting a set of times from said test envelope; and comparing said test set of times with said reference set of times to determine the mechanical condition of said machine. - View Dependent Claims (12, 13, 14)
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15. A method of determining a set of clustered events for a machine from a plurality of sets of events, wherein each of said sets has a number of events therein, from said machine comprising:
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acquiring a set of vibrational signals where each vibrational signal comprises a plurality of events of said machine; processing each vibrational signal to obtain a set of events for each vibrational signal and a plurality of sets of events for said machine; and
,clustering similar events from each of said plurality of sets to determine a set of clustered events for said machine. - View Dependent Claims (16, 17)
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18. A method of diagnosing a mechanical condition of a machine, comprising:
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sensing a single reference vibrational signal of said machine; creating a reference set of events and a reference envelope from said single reference vibrational signal of said machine; saving said reference set of events and said reference envelope; sensing a single test vibrational signal of said machine; creating a test envelope from said test vibrational signal of said machine; and
,comparing said test envelope with said reference envelope to determine the mechanical condition of said machine. - View Dependent Claims (19)
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20. A method of diagnosing a mechanical condition of a machine, comprising:
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sensing a reference vibrational signal of said machine; creating a reference envelope from said reference vibrational signal of said machine; saving said reference envelope; sensing a test vibrational signal of said machine; creating a test envelope from said test vibrational signal of said machine; and
,comparing said test envelope with said reference envelope to determine the mechanical condition of said machine wherein said comparing comprises determining if at least a predetermined number of resolution ratios computed from said test envelope and said reference envelope exceed a predetermined threshold.
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21. An apparatus for extracting a set of events from a vibrational signal of a machine wherein a subset of said events corresponds to a physical action of said machine, comprising:
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means for sensing a vibrational signal of said machine; means for creating a time domain signature from said vibrational signal; means for processing said signature to obtain a set of clustered events from a plurality of sets of possible events including in said set of clustered events a subset which corresponds to a physical action of said machine; and means for obtaining from said subset information representing the mechanical condition of said machine.
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22. An apparatus for diagnosing a mechanical condition of a machine, comprising:
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means for sensing a reference vibrational signal of said machine; means for creating a reference set of events from said reference vibrational signal of said machine including means for creating a reference envelope from said reference vibrational signal, and means for extracting a set of reference times from said reference envelope; means for saving said reference set of times; means for sensing a test vibrational signal of said machine; means for creating a test set of events from said test vibrational signal of said machine including means for creating a test envelope from said test vibrational signal, and means for extracting a set of reference times from said test envelope; and means for comparing said test set of times with said reference set of times to determine the mechanical condition of said machine.
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23. An apparatus for determining a set of clustered events for a machine from a plurality of sets of events, wherein each of said sets has a number of events therein, from said machine comprising:
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means for acquiring a set of vibrational signal where each vibrational signal comprises a plurality of events of said machine; means for processing each vibrational signal to obtain a set of events for each vibrational signal and a plurality of sets of events for said machine; and
,means for clustering similar events from each of said plurality of sets to determine a set of clustered events for said machine.
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24. An apparatus for diagnosing a mechanical condition of a machine, comprising:
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means for sensing a single reference vibrational signal of said machine; means for creating a single reference set of events and a reference envelope from said reference vibrational signal of said machine; means for saving said reference set of events and said reference envelope; means for sensing a single test vibrational signal of said machine; means for creating a test envelope from said test vibrational signal of said machine; and
,means for comparing said test envelope with said reference envelope to determine the mechanical condition of said machine.
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25. An apparatus for diagnosing a mechanical condition of a machine, comprising:
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means for sensing a reference vibrational signal of said machine; means for creating a reference envelope from said reference vibrational signal of said machine; means for saving said reference envelope; means for sensing a test vibrational signal of said machine; means for creating a test envelope from said test vibrational signal of said machine; and
,means for comparing said test envelope with said reference envelope to determine the mechanical condition of said machine wherein said comparing comprises determining if at least a predetermined number of resolution ratios computed from said test envelope and said reference envelope exceed a predetermined threshold.
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Specification